Filler Influence on H2 Permeation Properties in Sulfur-CrossLinked Ethylene Propylene Diene Monomer Polymers Blended with Different Concentrations of Carbon Black and Silica Fillers

Abstract

Filler effects on H2 permeation properties in sulfur-crosslinked ethylene propylene diene monomer (EPDM) polymers blended with two kinds of carbon black (CB) and silica fillers at different contents of 20 phr-60 phr are investigated by employing volumetric analysis in the pressure exposure range of 1.2 MPa ~ 9.0 MPa. A linear relationship is observed between the sorbed amount and pressure for H2 gas, which is indicative of Henry's law behavior. The hydrogen solubility of EPDM composites increases linearly with increasing filler content. The magnitude of hydrogen solubility for the filled EPDM composites is dependent on the filler type. The hydrogen solubility is divided into two contributions: hydrogen absorption in the EPDM polymer and hydrogen adsorption at the filler surface. Neat EPDM reveals pressure-dependent bulk diffusion behavior. However, with increasing filler content, the diffusivity for the filled EPDM composites is found to be independent of pressure. The magnitude of filler effects on the hydrogen permeation parameter is measured in the order of high abrasion furnace CB ~ semireinforcing furnace CB ˃ silica, whose effect is related to the specific surface area of CB particles and interfacial structure. The correlation between the permeation parameters and filler content (or crosslink density) is discussed.

Effect of Graphene Oxide-Modified CaAl-Layered Double Hydroxides on the Carbon Dioxide Permeation Properties of Fluoroelastomers

“…Figure 8b shows the schematic relationship between filler content and diffusion coefficient, in which the diffusion coefficient of the rubber composites decreased significantly with the increase in the filler content of LDH-Ca 2 Al and GO/LDH-Ca 2 Al, which is consistent with many previous findings [5,[58][59][60][61]. This finding was obtained because the filler increases the gas molecule diffusion path and hinders the gas molecule movement [6], while LDH-Ca 2 Al and GO/LDH-Ca 2 Al are multilayer fillers (Figures 2-4) with a layer spacing of more than 2.1 nm, which is significantly higher than the kinetic diameter of the CO 2 molecule (~0.33 nm).…”

H2 Uptake and Diffusion Characteristics in Sulfur-Crosslinked Ethylene Propylene Diene Monomer Polymer Composites with Carbon Black and Silica Fillers after High-Pressure Hydrogen Exposure Reaching 90 MPa

“…Sulfur with 1.5 phr is used as a crosslinking agent. The compounding method for EPDM rubber is detailed in the literature [ 26 ].…”

“…H 2 solubility in the filled EPDM is further influenced by the filler surface area and the interfacial structure between the filler and the polymer network. Similar studies of the filler effects on H 2 permeability were systematically conducted for nitrile butadiene rubber (NBR) [ 25 ] and EPDM [ 26 ] composites. In these studies, the contents of different fillers varied up to 60 phr.…”

Thermal Stability and Non-Isothermal Kinetic Analysis of Ethylene–Propylene–Diene Rubber Composite

“…Many studies have examined the effectiveness of blending EPDM rubber with other types of rubber to improve its physical or chemical properties; for instance, blending EPDM with natural rubber has been shown to improve its mechanical properties [12]. Scientists have studied the impact of additives such as accelerators [13], vulcanization agents [14], and other additives (during the preparation process) on the properties of EPDM [15][16][17].…”